Abstract: In a method for filling bottles or similar containers with a liquid under back pressure, at least a first flushing and a second flushing of the interior of the respective bottle are conducted in chronological sequence during a pre-treatment phase which precedes the actual priming of the respective container, by the timed introduction of a specified quantity of inert gas, with a subsequent evacuation of the interior of the bottle. The introduction of the specified quantity of inert gas takes place in a timed manner during each flushing, and is performed independently of the capacity at which the bottling system is currently being operated.